Refrigerator car hatch closure



J. s. LUNDVALL 2,314,649

REFRIGERATOR CAR HATCH CLOSURES Filed March 10, 1938 March 23, 1943.

5 Sheets-Sheet 1 O O O O Zia/610302"- Jbm 5. Zwddwll J. s. LUNDVALL 2,314,649

REFRIGERATOR CAR HATCH CLOSURES Filed March 10, 1938 5 Sheets-Sheet 2 March 23, 1943.

March 23, 1943.

J. S. LUNDVALL REFRIGERATOR CAR HATCH CLOSURES 5 Sheets-Sheet 3 Filed March 10, 1938 a 1 IE M57 2 aw! March 23, 1943. J. s. LUNDVALL 2,314,649

REFRIGERATOR CAR HATCH CLOSURES Filed March 10, 1938 Sheets-Sheet 4 7Q 93 I j um V...,.,,,.,,,,...,,.,,,,,,,,,, a

S Sheets-Sheet 5 m r w 9 I4 I: H a a 6 m 5 a w fnuemi'oz" J6 20.5- .Zlangiflali March 23, 1943. J. s. LUNDVALL REFRIGERATOR CAR HATCH CLOSURES Filed March 10, 1938 Patented. Mar. 23, 1943 UNITED STATES PATENT OFFICE REFRIGERATOR CAR. HATCH CLOSURE John S. Lund'vall, Chicago, Ill., assignor to Union Asbestos & Rubber Company, Chicago, Ill., a corporation of Illinois Application March 10, 1938, Serial No. 195,100

11 Claims.

The present invention relates to refrigerator car hatch closures and is particularly concerned with the construction of the refrigerator car hatchway, the closure therefor, and securing devices.

The hatch covers and plugs now generally in use in refrigerator cars comprise a plug that seats or seals in a tapered hatch opening frame and a separate cover which is pivotally mounted on the hatch frame. Such plugs are dimcult to operate or open without the use of a pry bar. Having two parts, one of which is loose, there is always a possibility of the loss of the plugs when the hatch way is open. Furthermore, it involves considerable labor to open or arrange the hatch closures of the prior art 'for travel of the refrigerator car under ventilation, as is customary with many types of cargo.

One of the objects of the invention is the provision of an improved refrigerator car structure comprising a hatchway and closure therefor, which is adapted to be operated as a unit, and which provides an improved structure for opening, closing, and ventilating refrigerator cars at the hatchway.

Another object of the invention is the provision of an improved hatchway and closure therefor which is arranged so that it may be readily secured for travel under ventilation, with the cover extending in either direction; that is, wide open or partially open.

Another object of the invention is the provision of an improved hatch closurestructure including the operating means therefor, which is so arranged that the hatchway cover is adapted to be supported by the operating means while it is being secured in place and while the seal is being applied.

Another object is the provision of an improved hatch closure and operating means therefor including force multiplying means for starting the opening of the hatch cover and means for securing the hatch cover .in ventilating position.

Another object of the invention is the provision of improved operating mechanism for hatchway closures, which is so arranged that when the cover drops upon the operating lever the operating lever is not adapted to be impelled upwardly in such a way that it might strike the operator.

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings, in which similar" characters of reference indicate similar parts throughout the several views.

Referring to the five sheets of drawings:

Fig. 1 is a top plan view of a portion of a refrigerator car, showing one corner of the car roof equipped with a hatchway closure and operating mechanism constructed according to the present invention;

Fig. 2 is a vertical sectional view, taken on the plane of the line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is a view similar to Fig. 2, with the cover in open position and arranged for ventilation of the car according to one of the modes of practice of refrigerator car ventilation;

Fig. 4 is another View, taken on the same line as Fig. 2, with the cover in another position, and secured by the operating mechanism therefor, with the cover in position to practise another mode of ventilation of the refrigerator car;

Fig. 5 is a vertical sectional view taken through the hatchway and closure, on the plane of the line 55 of Fig. 1, looking in the direction of the arrows;

Fig. 6 is a diagrammatic top plan view of a refrigeratoncar, showing the location of the hatchways and closures in the car roof;

Fig. 7 is a, full sized fragmentary sectional view taken on the same plane as Fig. 2 and showing the seal and details of the operating mechanism adjacent thereto, with the operating mechanism in position to begin the opening of the cover;

Fig. 8 is a similar view, with the opening of the cover begun and the cover loosened, so that it may thereafter be opened by use of the hand applied to the handle on the cover;

Fig. 9 is a fragmentary top plan view of the mechanism of Fig. 7;

Fig. 10 is a vertical sectional view taken on the plane of the line l0--lli of Fig. 7, looking in the direction of the arrows;

Fig. 11 is a vertical sectional view, taken on the plane of the line ll--ll of Fig. '7, showing the mechanism for securing the cover in locked position.

Referring to Fig. 6, 20 indicates a refrigerator car, the roof of which is indicated by 2|, and which is provided with the customary runway 22 and hatchways 23-26, each of which is provided with a suitable hatchway and hatchwa;, cover. It will be observed that the hatchways are located at each corner of the car, two hatchways being provided for each ice chamber.

Referring to Figs. 1-3, these views show on a larger scale the construction of the hatchway and hatch closure therefor at the lower left corner of Fig. 6. The car roof 2| in Fig. 2 is formed of a plurality of sections of steel, suit ably joined together. Between the car roof 2| and ceiling 21 the car is provided with suitable insulation 28 at all points except at the opening 25 or hatchways. At the hatchway 25 the car is provided with suitable cross frame members 29, 30, to which are secured the transverse frame members 3|, 32 that form the hatchway 25.

Referring to Fig. 5, which shows a section of the hatchway on a transverse plane, it will be observed that longitudinally extending hatchway frame members 33 and 34 extend between the frame members 3|, 32 to define the hatchway Z5. lnsulation 36 extends over the frame members 29--34 in order that the ceiling of' the refrigerator car may be insulated as thoroughly as possible up to the hatchway opening 25. The steel roof 2| of the car has its sections turned up at 31 around the frame for the hatchway and secured to a sheet metal frame member 38, which supports the structure of the hatch cover and provides an upwardly projecting framing for the hatchway 25.

Sheet metal member 38 embraces wooden frame members 39 at each side of the hatchway, and for this purpose the member 38 has an upwardly projecting flange 40, a horizontally extending flange 4|, and a downwardly turned edge 42. The member 38 also extends horizontally at 43 below the wooden members 39 and extends diagonally inwardly and downwardly at 44 to provide a tapered opening leading to the hatchway 25. The vertical flange may be reinforced by an angle iron 45, having a vertical flange and a horizontal flange, and the hinge members and other fixtures may be secured to the vertical flange 48 and angle iron by bolts or other suitable fastening means, such as rivets.

The upper horizontal flange 4| serves as a sealing surface for engaging a seal 51 carried by the cover; and flange 4| defines an unbroken and continuous metal border flange around the top of the hatchway.

The hatch closure or cover is indicated in its entirety by the numeral 41 and the operating mechanism therefor by the numeral 48 in Fig. 2.

Referring to Fig. 2, the cover 41 may comprise a sheet metal member of box-like form, which is filled with insulation 49. This box-like member comprises an upper sheet metal body 58, which is of suflicient size to extend over and beyond the vertical flange 40 carried by the wooden frame members 39. At its border the upper sheet metal member 58 is provided with a depending border flange 5|, which is located outside of the vertical flange 40 on the hatchway. The cover is formed by the use of another sheet metal member 52, which has a flat lower body and an upwardly extending border flange 53, terminating in horizontal attaching flanges 54, which are riveted or welded to the sheet metal member 50, after the insulation has been placed therein.

The flanges 5| and 53 form a downwardly open steel recess around the cover 41, the recess being rectangular in form and indicated by the numeral 55. Each of the four parts of this groove or recess 55 is provided with a wooden backing member 56, suitably rabbeted to receive the flanges 54, and the wooden strips 56 may be secured in place by cement, by rivets, by frictional flt, or any convenient fastening means.

Secured to the wooden strips 56 and extending completely around the cover 41 within the groove 55 is a sealing member comprising one or more strips of sponge rubber of rectangular section, which are clamped to the wooden strips 56 by a plurality of screw bolts 58 (Fig. 8) and a metal clamping strip 58.' The sealing member is indicated by the numeral 51.

The screw bolts and metal clamping strip are located adjacent the vertical flange 53 out of alignment with the edge flange 4| of the hatchway, so that the rubber sealing strip 51 engages the horizontal flange 4| of the hatchway and effects an air-tight and fluid-tight seal between the cover and the hatchway.

Fig. '7 shows the compression of the rubber strips at the point of clamping by the bolts 58 and metal strips 59 and the compression of the rubber sealing 51 between the edge of the hatchway and the cover. The cover is secured to the hatchway by a. plurality of hinges (Fig. 4), the upper or cover hinge plate 60 being secured to the cover by rivets or other convenient fastening means and having a cylindrical body at its left end for engaging the pintle 6|. The pintle 6| is carried by the hinge bracket 62, which has an attachment flange 63 secured to the upwardly extending flange 40 on the hatchway'by a plurality of rivets or other convenient fastening means.

A runway 22 has extensions around the hatchways, and the extension toward the end of the car at the left of Fig. 4 may be utilized for supporting the cover in open position, as shown in Fig. 3. For this purpose the cover is provided with a triangular sheet metal bracket 64, having an attaching flange secured to the upper body plate 50 of the cover, by rivets, and having upwardly extending arms 65, 66 joined together at an acute angle.

The angle 6! at the base of the arm 65 is also an acute angle so that when the cover is in the position of Fig. 3, with the arm 65 engaging the runway 22, the cover is pivoted over toward the left in Fig. 3, past its dead center, and its weight is supported by the bracket 64. A bracket 68 (Fig. 3) similar to one-half of a hinge may pivotally support a U-shaped metalrod 69, which may be slid laterally in the bracket 68 and pivoted upwardly to the dotted line position of Fig. 3, after which it may be slid laterally again and its leg 10 caused to engage in the triangular bracket 64. The U-shaped rod 69 has a suitable slot for receiving the customary car seal, by means of which the cover may be secured and sealed in the position of Fig. 3.

The cover 4'! is provided with a suitable handle 1| in the form of a U-shaped rod, having attaching flanges which may be riveted to the cover, as shown in Fig. 5. It is also preferably pro-= vided with an operating mechanism for the purpose of securing the cover in air-tight relation to the hatchway and for effecting its release and securement in various other positions.

This mechanism, already indicated by the numeral 48, is located (Fig. 2) at the opposite side of the cover from the hinges 6062.

Referring to Fig. 2, the mechanism includes a keeper fixture l3 and a pivoted lever 14, which is carried by a suitable bracket 7.5 mounted on the upwardly extending flange 4|! of the hatchway frame member 38.

Referring to Fig. 7, this mechanism is here shown in detail. The bracket 15 comprises a T-shaped structural member 16, the upper part of the T being secured by rivets to the flange 48, and the stem of the T extending at a slight angle so as to make the stem or flange 11 horizontal. The complete bracket includes an angular cast metal member having an attaching flange 18, which is riveted to the flange 11, and having a pair or upwardly extending reinforcing arms 18, which are provided with bores 88 for receiving a shaft 8|.

The shaft 8| may consist of a bolt and nut, as shown in Fig. 9, and it is adapted to pivotally support the lever 14, which serves not only to secure the cover in closed position, but also to eii'ect its release and to secure it in various open positions.

The lever 14 may consist of an elongated cast metal member (Fig. 3) which is of substantially U-shape in cross section and is formed with a plurality of flange extensions 82, on each side, each of which is provided with an aperture 88, and with a shelf or supportingflange 84 joining the two flanges of the U.

Referring to Fig. 8, the lever 14 has its end provided with a pair of legs 88, each of which is provided with a bore 86 for receiving the bolt 8|. Between the legs 88 on' the bolt 8| there is mounted a pivotal stop member 81, which is also used in conjunction with the lever 14 for prying the cover open. 7

The cover (Figs. 7-9) is provided with a cast metal fixture or keeper 18, which is substantially triangular in plan as seen in Fig. 9, and which is provided with a pair of upwardly extending lugs 88 located opposite each other and provided with the bores 88 for slidably receiving the longer leg 88 of the U-shaped retaining rod. The other leg 8| is preferably pointed at 82 to facilitate its entry into the apertures. of the fixture, and it is adapted to register with the bore 88 in another upwardly extending lug 84 carried by the fixture 18.

The U-shaped rod 88, 8| has the end of its longer leg 88 riveted over or provided with a head at 85, and the leg 88 is sufflciently long so that in Fig. 9 the U-shaped rod may be moved upwardly until the end 82 emerges completely from the bore 88. The lever 14 has an oblong aperture 88 in its two side flanges 81, 88 (Fig. 11) and it is also provided with a downwardly extending prying extension 88 (Fig. 7) located between the flanges 81, 88 and adapted to engage the outwardly projecting lug I88 carried by the cover flxture 18.

When the part 88 engages the lug I88, the lever 14 is almost horizontal and the lever 14 may be pushed down to compress the rubber seal 48 until the apertures 88 and 88 are in registry. The lever may then be held in place by the U- shaped rod or clevice 88, 8|, which is provided with suitable slots for receiving the customary car seal.

Referring to Figs. 8 and 9, the member 81 comprises a cast metal member provided with a bore IIII for receiving the bolt 8|, upon which it is pivotally mounted between the legs 85 of the lever 14. vided with another prying extension or flange I82, which, as shown in Fig. 8, is adapted to engage a radially projecting lug I88 carried by the member 81. Another similar radially projecting lug I84 has its toe I88 in engagement with the lug I88 on the cover. Thus, when the lever 14 is moved away over to the right, as in Fig. 8, it engages the member 81 to movethat The lever 14 has its upper side promember in a clockwise direction, the toe I85 prying the cover 41 upward to loosen the cover from the hatchway. i

The covers are quite heavy and sometimes become frozen in place, and therefore it is necessary to provide some means for prying the covers loose when they are to be opened, and this is accomplished by means of the arrangement described.

The member 81 has only a limited range of movement on the bolt 8| because its radially extending legs I88, I84 are on opposite sides of a stop-flange I88. The leg I84 and toe I88 may move downward in Fig. 8 only until theJeg I84 engages the flange I88, and thus, when the cover is dropped on the member I84, only an impulse of limited movement is transmitted to the handle or lever 14.

Fig. 2 shows the cover secured in closed position, as does also Fig. 7.

Fig. 8 shows the cover as it appears when it has been pried loose and is ready to be opened by means of the handle 1|.

Referring to Fig. 4. this shows the cover in position for ventilating the car through the hatchway. It is placed in this position by lifting the cover with one hand and holdingthe lever 14 with the other hand. The cover is permitted to rest on one of the ledges 84 by means of the lug I88. The lug I88 has its bore I81 so located that it will then register with one of the bores 88 in the lever 14. The bore I81 is also spaced from the bore 88 sufliciently so that the clevice or U-shaped rod 88, 8| is also adapted to have its leg 8| register with the bore I81. Then the clevice may be turned over to the position of Fig. 4 and said laterally until the leg 8| .of the rod extends'through the bores I81 and 88.

A car seal may then be applied to the U-shaped rod 88, 8| to lock the cover in the open position of Fig. 4. Since there are a plurality of the apertures 88 and ledges 84, the cover 41 may be secured at various open positions or with various degrees of opening to regulate the amount of ventilation of the car. As the covers are quite heavy, the ledges 84 are of great assistance in supporting the cover while the operator is manipulating the locking arrangement.

The present hatchway closure need not be provided with any plug for closing the hatchway, as the cover alone is insulated and adapted to effect an air-tight and insulated closure of the hatchway. The box-like member 52, 88 is willciently smaller than the opening in the hatchway between the wooden frame members 48 so that the cover may pivot in or out of the hatchway without interference. There is only a small portion of the cover around the seal which does not have the same amount of insulation as the remainder of the car, and the amount of heat transmission through this portion is very small.

It will thus be observed that I have invented an improved hatchway closure and operating means therefor, which may be operated as a unit and which is provided with means for securing the cover in a plurality of different open positions, or for securing and locking the cover in closed position.

The operating mechanism is also adapted to pry the cover loose and is adapted to support the cover during the securing operation. The present hatchway closure is well insulated and effectively sealed against the passage of air or moisture when the cover is closed, and it is arranged so that it may conveniently operate, even when the roof of the car is slippery from rain or snow.

The cover gasket is placed under a predetermined compression by the operating lever and secured in place with such compression by means of the slidable seal pin. The cover may also be secured in fully open position. The arrangement of the mechanism is such that the amount of throw-over of the operating lever, when the cover is dropped on its prying end, is limited.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit "of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims,

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is: I

1. In a combined latching and supporting mechanism for hinged hatch covers of refrigerator cars, the combination with an apertured lug aflixed to and extending outwardly from the free edge of the cover, of an arm swingingly mounted on a fixed support adjacent to the free edge of said cover when said cover is in closed position, said arm being pivoted on an axis parallel to the axis of swinging movement of the cover and swingable into and out of engagement with said lug in a plurality of predetermined opened positions of the cover, said arm being provided with a plurality of apertures extending serially in predetermined spaced relationship longitudinally of said arm, a plurality of spaced apart abutments extending laterally from said arm, each of said abutments being in predetermined spaced relationship with one of said plurality of apertures whereby to supportably hold the free edge of said cover in selective open positions and whereby the aperture in said lug and the aperture in said arm adjacent the supporting abutment will be in registering alignment when said cover is supported in one of said selective open positions, and a looking pin adapted to be inserted through the apertures of said lever, said locking pin having means whereby it may be sealed against unauthorized access.

2. In a latching, opening, and supporting mechanism for refrigerator car hatch closures, the combination of a keeper member having a supporting flange provided with a pair of upwardly extending apertured lugs and with a forwardly extending apertured lug, means for mounting the keeper member on the hatch cover in operative position with respect to a lever, and a supporting bracket, means for securing said support to the hatchway framing, said supporting bracket being provided with a pair of bearings for supporting a shaft, a stub shaft in said bearings, a channelled metal lever having a pair of lateral flanges joined by an upper web, and a prying member rotatably mounted on said stub shaft between the side flanges of said lever, said prying member having a radially extending lug for engaging said forwardly extending lug on said keeper, and having a. second radially extending lug for engaging a part of the web of said lever, said latter two radial lugs being downwardly disposed whereby the lever may be moved to extend oppositely from said keeper to engage one of said radial lugs and bring the other of said radial lugs into prying engagement with the forwardly extending lug.

3. In a latching, opening, and supporting mechanism for refrigerator car hatch closures, the combination of a keeper member having a supporting flange provided with a pair of up- .of lateral flanges joined by an upper web, anda prying member rotatably mounted on said stub shaft between the side flanges of said lever, said prying member having a radially extending lug for engaging said forwardly extending lug on said keeper, and having a second radially extending lug for engaging a part of the web of said lever, said latter two radial lugs being downwardly disposed whereby the lever may be moved to extend oppositely from said keeper'to engage one of said radial lugs and bring the other of said radial lugs into prying engagement with the forwardly extending lug, stop means carried by said supporting bracket for engaging said radially extending lugs and limiting their movement. to a relatively small angle so that the dropping of the hatch cover on said radial prying lug will not cause a damaging throw of said lever.

4. In a latching, opening, and supporting mechanism for refrigerator car hatch closures, the combination of a keeper member having a supporting flange provided with a pair of upwardly extending apertured lugs and with a forwardly extending apertured lug, means for mounting the keeper member on the hatch cover in operative position with respect to a lever, and a supporting bracket, means for securing said support to the hatchway framing, said supporting bracket being provided with a pair of bearings for supporting a shaft, a stub shaft in said bearings, a channelled metal lever having a pair of lateral flanges joined by an upper web, and a prying member rotatably mounted on said stub shaft between the side flanges of said lever, said prying member having a radially extending lug for engaging said forwardly extending lug on said keeper, and having a second radially extending lug for engaging a part of the web of said lever, said latter two radial lugs being downwardly disposed whereby the lever may be moved to extend oppositely from said keeper to engage one of said radial lugs and bring the other of said radial lugs into prying engagement with the forwardly extending lug, whereby the prying member may be maintained in hatch-engaging position at all times and the lever may be permitted to rest in open position while the hatch is closed. 5. In a latching, opening, and supporting mechanism for refrigerator car hatch closures, the combination of a keeper member having a supporting flange provided with a pair of upwardly extending apertured lugs and with a forwardly extending apertured lug, and a supporting bracket adapted to be secured to the hatchway framing, said supporting bracket being provided with a pair of bearings for supporting a shaft, a stub shaft in said bearings, a channelled metal lever having a pair of lateral flanges joined by an upper web, said lateral flanges having aligned apertures and a prying member rotatably mounted on said stub shaft between the side flanges of said lever, said prying member having a radially extending lug for engaging said forwardly extending lug on said keeper, and having a second radially extending lug for engaging a part of the web of said lever, said latter two radial lugs being downwardly disposed whereby the lever may be moved to extend oppositely from said keeper to engage one of said radial lugs and bring the other of said radial lugs into prying engagement with the forwardly extending lug, said lever being provided with a plurality of supporting flanges extending between the lateral flanges of said lever and each flange being below aligned apertures in said lateral flanges, said supporting flanges being located to engage beneath said forwardly extending ing to hold the hatch while it is being secured by a member passing through the aperture in said forwardly extending lug and said registering apertures of said lever.

'6. In a fastener for hinged hatch covers for refrigerator cars, the combination with an outstanding lug on the'free edge of said cover; of an arm pivotally mounted on a fixed support adjacent said free edge, said arm having a plurality of transverse, longitudinally spaced supporting ribs projecting from one side thereof on able through said upstanding lug and one of the openings of said series to lock the cover in closed position; a support for said latch bolt on which the same is slidably guided in alignment with the perforation of said upstanding lug, said latch bolt being also pivotally mounted for movement into position where it may be engaged with said extending perforated lug and one of said openings of said series to lock said cover in partly open position for ventilating purposes.

9. In a fastener for hinged hatch covers of refrigerator cars, the combination with a ing projecting from the free edge of the cover; of an arm swingingly mounted on a fixed support, a pivoted member actuated by said arm and engageable with said lug for prying the cover open, said arm having a plurality of supporting ribs thereon, said ribs extending transversely of the any one of which said lug may be supported, and

a latch receiving opening extending through said arm adjacent each projecting rib adapted to align with the perforation of said lug when the latter is supported by the corresponding rib; and a sliding latch bolt engageable through said perforation of the lug and the aligned opening of the arm to lock said arm to the cover in supporting relation.

7. In a fastener for hinged hatch covers for refrigerator cars, the combination with an arm swingingly supported adjacent the free edge of the cover; of a plurality of transversely disposed, projecting ribs on one side of said arm providing supporting shelves, said shelves being arranged in series lengthwise of said arm,said arm having an opening adjacent each shelf; a lug on said cover adapted to be engaged with and supported by any one of said shelves; and latch means engageable through said lug and the opening ad- Jacent the shelf on which said lug is supported for locking the cover to said arm.

8. In a fastener for hinged hatch covers of refrigerator cars, the combination with an upstanding perforated lug on the top of said cover spaced inwardly from the edge thereof; of a perforated lug extending from the free edge of said cover; a swinging arm pivoted to a fixed support adjacent the free edge of the cover, said arm having a series of openings arranged lengthwise thereof, said arm being foldable over the cover to force said cover to closed position and hold the same in said position; a latch bolt engagearm and being arranged in series lengthwise of the arm, said ribs of said series being spaced apart lengthwise of said arm to accommodate said lug therebetween and serving as supports for said lug to hold the cover in different adjustments of partly open position.

10. In a fastener for hinged hatch covers for refrigerator cars, the combination with an outstanding lug on the free edge of said cover; of an arm pivotally mounted on a fixed support adjacent said free edge, said arm having a plurality of transverse, longitudinally spaced supporting ribs on one side thereof on any one of which said lug may be supported, and a latch receiving opening extending through said arm adjacent each projecting rib adapted to align with the perforation of said lug when the latter is supported by the corresponding'rib and a sliding latch bolt engageable through said perforation of the lug and the aligned opening of the arm to lock said arm to the cover in supporting relation.

11. In a fastener for hinged hatch covers for refrigerator cars, the combination with an arm swingingly supported adjacent the free edge of the cover; of a plurality of transversely disposed ribs onone side of said arm providing supporting shelves, said shelves being arranged in series lengthwise of said arm, said arm having an opening adjacent each shelf; a lug on said cover adapted to be engaged with and supported by any one of said shelves; and latch means engageable through said lug and the opening adjacent the shelf on which said lug is supported for locking the cover to said arm.

JOHN S. LUNDVALL. 

